Time-damper for furnaces.



No. 687,764. Patantad Dec. 3, I901.

- C. E. LUNDBLAD.

TIME DAMPER FOR FURNACES.

Application flied July 18, 1901.)

(No Model.)

C E.L wnaZZZad THE uonms PETERS co, wow-mm) WASHINGTON o. c.

UNITED' STATns ATnT Fries."

CARL E. LUNDBLAD, OF DULUTH, MINNESOTA.

TIME-DAM PER FOR FURNACES.

SPECIFICATION forming part of Letters Patent No. 687,764, dated December3, 1901. Application filed July 18, 1901. Serial No. 68,770. (No model.)

To ctZZ whom it may concern:

Be it known that I, CARL E. LUNDBLAD, a citizen of the United States,residing at Duluth, in the county of St. Louis and State of Minnesota,have invented certain new and useful Improvements in Automatic Draft-Openers for Furnaces; and I do declare the following to be a full,clear, and exact'description of the invention, such as will enableothers skilled in the artto which it appertains to make and use thesame.

This invention relates to improvements in automatic draft openers forfurnaces, designed to open the dampers at a predetermined time topromote combustion.

The object of the invention is to provide automatic mechanism of thischaracter which shall be simple, durable, and efiective in constructionand operation and tobe operated through the medium of an ordinaryalarmclock, whereby said mechanism may be set to close the dampers tokeep up the fire over night and to operate to open the dampers at anydesired hour in the morning.

The invention consists in certain novel features of construction,combination, and arrangement of parts, as will be hereinafter more fullydescribed, and particularly pointed out in the appended claim.

In the accompanying drawings, Figure l is a side elevation showing theparts of the automatic mechanism as arranged in use for holding thedampers closed; and Fig. 2 is a rear elevation of the clock andcooperating parts of the damper-controlling mechanism, showing theoperation of the latter in full and broken lines.

Like reference characters designate corresponding parts throughout theviews.

The numeral 1 in the drawings represents an alarm clock of ordinaryconstruction, which is secured by means of a band 2 or any otherpreferred kind of fastening to a base 3,

- which is secured in practice to the top of the boiler or furnace inconnection with which the improved damper-controlling mechanism is used.I

Upon the base 3, in rear of the clock, is mounted a supporting-bracket4, which projects at one end beyond the clock and is pro vided withsupporting arms 5 and 6 and a guide-frame '7, the latter being locatedat said projecting end. In this frame slides a vertically-reciprocatingbolt or retaining member 8, which is pivoted at its lower end to one endof a vibrating lever 9, fulcrumed at an intermediate point to a pin 10,fixed upon or journaled in the supporting-arm 6. The opposite end ofthis lever is normally held downward by a spring 10 and is slotted, asat 11, to receive a pin or stud 12 upon one arm of abellcrank lever 13,pivoted to the supporting-arm 5. The opposite arm of the bell-cranklever has pivoted thereto the lower end of a curved trip-lever 14, thefree end of which is adapted to be engaged by a lug 15 upon either oneof the arms of a rotary tripping device 16, fixed upon the winding-shaft17 of the alarm mechanism of the clock 1. A spring 18 holds the saidtrip-lever 14 in operative position relatively to the bell-crank lever13 and yields to the right in the act of winding up the trip device 16.

A chain or analogous flexible connection 19 extends past that side ofthe clock on which the guide-frame 7 is mounted and has attached theretoa ring or eye 20 to engage the upper end of the bolt or retaining member8. One end of this chain passes forwardly over a pulley 2]. on the base3 and is adapted to be connected to the draft-door of the furnace, whilethe other end of said chain projects rearwardly and carries a ring 22,to which are connected a retracting-spring 23 and a chain 24. The spring23 is secured to a block or other stationary object on or adjacent tothe furnace, while the chain 24: is adapted to connect the chain 19 withthe damper in the smoke-pipe of the furnace or in the chimney into whichsaid pipe discharges.

The operation is as follows: When it is desired to set the mechanism,hold the draftdoor and damper closed, and to release them at apredetermined time the alarm mechanism of the clock is set to operate atthe time it is desired to have the dampers open, the trip-lever 1tengaged with the trip device 16, and the ring or eye 20 engaged with theupper projecting end of the bolt or retaining member 8. To engage saidring or eye with the bolt necessitates the stretching of the spring 23,whereby said spring is placedun der tension, the chain 24 drawn taut toclose the damper in the chimney or smoke-pipe,

and the forward end ofthe chain 19 slackened to allow the draft-door ofthe furnace to close. At the time set for the alarm mechanism to operatethe movement of the trip device 16 will force the parts of the tripmechanism to the dotted-line position shown in Fig. 2, whereby the bolt8 is retracted and releases the ring or eye 20. The spring 23 thereuponpulls upon and draws the chain 19 rearwardly, whereby the draft-door ofthe furnace is opened, and at the same time the chain 24 is slackened,so as to allow the damper in the smoke-pipe or chimney to open. Theaction of the spring immediately upon the release of the ring or eye 20restores the parts of the trip mechanism to their normal positions,(shown in full lines in Fig. 2,) as will be readily understood.

The construction, mode of operation, and advantages of the inventionwill be fully understood from the foregoing description, and it will beseen that simple and effective automatic draft-controlling mechanism isprovided.

Changes in the form, proportion, and minor details of construction maybe made within the scope of the invention without departing from thespirit or sacrificing any of the ad vantages thereof.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

In automatic draft-openers for furnaces, the combination with clockworkmechanism adapted to be set to operate at a predetermined time andprovided with a trip, of a bolt, damper connections adapted to beengaged with the bolt when the latter is projected to hold the dampersclosed, a spring set under tension by the engagement of said connectionswith the bolt and adapted when said bolt is withdrawn to retract thedamper connections to open the dampers, a vibrating lever connected Withthe bolt, a spring acting on said lever to project the bolt, abell-crank lever connected to said vibrating lever, and a yieldingtrip-lever connected to said bellcrank lever and cooperating with thetrip device of the clockwork mechanism, substan tially as described.

In testimony whereof I have hereunto set my hand in presence of twosubscribing wit nesses.

CARL E. LUNDBLAD.

Witnesses:

P. GEO. HANSON, OLE PETERSON.

